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I21 Acute myocardial infarction
BackI21.0ST elevation (STEMI) myocardial infarction of anterior wallCategory3 →I21.01ST elevation (STEMI) myocardial infarction involving left main coronary arteryCategoryI21.02ST elevation (STEMI) myocardial infarction involving left anterior descending coronary arteryCategoryI21.09ST elevation (STEMI) myocardial infarction involving other coronary artery of anterior wallCategoryI21.1ST elevation (STEMI) myocardial infarction of inferior wallCategory2 →I21.11ST elevation (STEMI) myocardial infarction involving right coronary arteryCategoryI21.19ST elevation (STEMI) myocardial infarction involving other coronary artery of inferior wallCategoryI21.2ST elevation (STEMI) myocardial infarction of other sitesCategory2 →I21.21ST elevation (STEMI) myocardial infarction involving left circumflex coronary arteryCategoryI21.29ST elevation (STEMI) myocardial infarction involving other sitesCategoryI21.3ST elevation (STEMI) myocardial infarction of unspecified siteCategoryI21.4Non-ST elevation (NSTEMI) myocardial infarctionCategoryI21.9Acute myocardial infarction, unspecifiedCategoryI21.AOther type of myocardial infarctionCategory2 →I21.A1Myocardial infarction type 2CategoryI21.A9Other myocardial infarction typeCategoryI21.BMyocardial infarction with coronary microvascular dysfunctionCategory
Category
I21
Acute myocardial infarction
INCLUDES
cardiac infarction
coronary (artery) embolism
coronary (artery) occlusion
coronary (artery) rupture
coronary (artery) thrombosis
infarction of heart, myocardium, or ventricle
myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
coronary (artery) embolism
coronary (artery) occlusion
coronary (artery) rupture
coronary (artery) thrombosis
infarction of heart, myocardium, or ventricle
myocardial infarction specified as acute or with a stated duration of 4 weeks (28 days) or less from onset
EXCLUDES
Excludes2: old myocardial infarction (I25.2)
postmyocardial infarction syndrome (I24.1)
subsequent type 1 myocardial infarction (I22.-)
postmyocardial infarction syndrome (I24.1)
subsequent type 1 myocardial infarction (I22.-)
CODING RULE
Use additional code: code, if applicable, to identify:
exposure to environmental tobacco smoke (Z77.22)
history of tobacco dependence (Z87.891)
occupational exposure to environmental tobacco smoke (Z57.31)
status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
tobacco dependence (F17.-)
tobacco use (Z72.0)
exposure to environmental tobacco smoke (Z77.22)
history of tobacco dependence (Z87.891)
occupational exposure to environmental tobacco smoke (Z57.31)
status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
tobacco dependence (F17.-)
tobacco use (Z72.0)
- Chapter
- IX · Diseases of the circulatory system
- Section
- I20-I25
- Valid from
Source
CMS ICD-10-CM Tabular List, edition FY2026.